1 user='liangml'
2 passwd='liangml'
3 username=input('username:')
4 password=input('password:')
5 #优化前
6 '''
7 if user == username:
8 print('usernameiscorrect...')
9 if passwd == password:
10 print('welcomelogin...')
11 else:
12 print('passwordifinvalid...')
13 else:
14 print('user name is not...')
15 '''
16 '''
17 #优化后
18 if user == username and passwd == password:
19 print('Welcomelogin')
20 else:
21 print('Invalid user name or password...')
22 '''
23
24 --------------------分界线----------------------
25 If语句猜年龄小游戏
26 age=22
27 guess_num=int(input('inputyourguessnum:'))
28 if guess_num==age:
29 print('Congratulations!yougotit.')
30 elif guess_num>age:
31 print('Thinksmaller!')
32 else:
33 print('ThinkBig...')
